“When you don’t know what to look for or can’t recognise what you are seeing, it can be easy to miss warning signs or dismiss them as unimportant.

“That can lead to tragic consequences, including someone hurting themselves or others.

“It is important for us to show youth and adults that they are not helpless in protecting their community from gun violence — these acts are preventable, when you know the signs. Everyone has the power to intervene and get help. These actions can save lives.”

Nicole Hockley lost her son the day of the massacre. He was only in first grade.

If you or someone you know is in need of mental health support, please contact BeyondBlue at 1300 22 4636 If you are in immediate danger, contact 000.